Date: 11-15-19
Revision: 2
5.7.8-4
VASHON AIRCRAFT RANGER R7 MAINTENANCE MANUAL
Unable to obtain
sufficient hydraulic brake
pressure, excessive toe
pedal travel, or spongy
pedal
Air in hydraulic system
Check for source, then
bleed hydraulic system
Leak in system; brake,
master cylinder, fittings,
or lines
Locate leak and repair
Defective master cylinder Replace or repair
Back plate bolts loose or
not properly torqued,
causing excessive brake
deflection
Torque bolts to proper
value
Excessive rusting,
scoring, or pitting of
brake disc
Clean and replace bolts
Excessive brake shoe
deflection caused by bent
bolts or over torquing
bolts
Check and replace bolts
Incorrect lining and/or
disc
Replace with correct parts
Defective caliper
Rebuild caliper
Rapid disc and lining
wear
Excessive rusting,
scoring, or pitting of
brake disc
Clean or replace disc
Excessive brake shoe
deflection caused by bent
bolts or over torquing
bolts
Check and replace bolts
Brakes will not hold
Lining worn below
minimum wear limits
Replace linings
Discs worn below
minimum wear limits
Replace discs
Contaminated lining
Replace lining
New lining installed with
old disc, lining not seated
in wear track creating
partial contact with disc
Replace excessively worn
disc
Brake lining plate installed
backwards
Remove, inspect, and
install
MAIN WHEELS
Required Tools:
No special tools are required for this operation.